internal static IObjectHandle GetCustomLoader(ICustomLoaderHelperFunctions helperFunctions, string appConfigMetabasePath, string configFilePath, string customLoaderPhysicalPath, out AppDomain newlyCreatedAppDomain) {
// Step 1: Does the host allow custom loaders?
bool? customLoaderIsEnabled = helperFunctions.CustomLoaderIsEnabled;
if (customLoaderIsEnabled.HasValue) {
if ((bool)customLoaderIsEnabled) {
// The custom loader is enabled; move on to the next step.
}
else {
// The custom loader is disabled, fail.
throw new NotSupportedException(ApplicationServicesStrings.CustomLoader_ForbiddenByHost);
}
}
else {
// The host hasn't set a policy, so we'll fall back to our default logic of checking the application's trust level.
if (!IsFullyTrusted(helperFunctions, appConfigMetabasePath)) {
throw new NotSupportedException(ApplicationServicesStrings.CustomLoader_NotInFullTrust);
}
}
// Step 2: Create the new AD
string binFolderPhysicalPath = helperFunctions.MapPath("/bin/");
AppDomainSetup setup = new AppDomainSetup() {
PrivateBinPathProbe = "*", // disable loading from app base
PrivateBinPath = binFolderPhysicalPath,
ApplicationBase = helperFunctions.AppPhysicalPath,
TargetFrameworkName = _customLoaderTargetFrameworkName
};
if (configFilePath != null) {
setup.ConfigurationFile = configFilePath;
}
AppDomain newAppDomainForCustomLoader = AppDomain.CreateDomain("aspnet-custom-loader-" + Guid.NewGuid(), null, setup);
try {
// Step 3: Instantiate helper in new AD so that we can get a reference to the loader
CustomLoaderHelper helper = (CustomLoaderHelper)newAppDomainForCustomLoader.CreateInstanceAndUnwrap(_customLoaderAssemblyName, _customLoaderTypeName,
ignoreCase: false,
bindingAttr: BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.CreateInstance | BindingFlags.Instance,
binder: null,
args: null,
culture: null,
activationAttributes: null);
ObjectHandle ohCustomLoader = helper.GetCustomLoaderImpl(customLoaderPhysicalPath);
// If we got this far, success!
newlyCreatedAppDomain = newAppDomainForCustomLoader;
return ohCustomLoader;
}
catch {
// If something went wrong, kill the new AD.
AppDomain.Unload(newAppDomainForCustomLoader);
throw;
}
}
private static bool IsFullyTrusted(ICustomLoaderHelperFunctions helperFunctions, string appConfigMetabasePath)
{
// The managed configuration system hasn't yet been instantiated but the IIS native config system understands
// ASP.NET configuration and honors hierarchy and section locking.
try {
// Must exactly match <trust level="Full" />, as this is what ApplicationManager expects.
string trustLevel = helperFunctions.GetTrustLevel(appConfigMetabasePath);
return(String.Equals("Full", trustLevel, StringComparison.Ordinal));
}
catch {
// If any of the sections are locked or there is a config error, bail.
return(false);
}
}
private static bool IsFullyTrusted(ICustomLoaderHelperFunctions helperFunctions, string appConfigMetabasePath) {
// The managed configuration system hasn't yet been instantiated but the IIS native config system understands
// ASP.NET configuration and honors hierarchy and section locking.
try {
// Must exactly match <trust level="Full" />, as this is what ApplicationManager expects.
string trustLevel = helperFunctions.GetTrustLevel(appConfigMetabasePath);
return String.Equals("Full", trustLevel, StringComparison.Ordinal);
}
catch {
// If any of the sections are locked or there is a config error, bail.
return false;
}
}
internal static IObjectHandle GetCustomLoader(ICustomLoaderHelperFunctions helperFunctions, string appConfigMetabasePath, string configFilePath, string customLoaderPhysicalPath, out AppDomain newlyCreatedAppDomain)
{
// Step 1: Does the host allow custom loaders?
bool?customLoaderIsEnabled = helperFunctions.CustomLoaderIsEnabled;
if (customLoaderIsEnabled.HasValue)
{
if ((bool)customLoaderIsEnabled)
{
// The custom loader is enabled; move on to the next step.
}
else
{
// The custom loader is disabled, fail.
throw new NotSupportedException(ApplicationServicesStrings.CustomLoader_ForbiddenByHost);
}
}
else
{
// The host hasn't set a policy, so we'll fall back to our default logic of checking the application's trust level.
if (!IsFullyTrusted(helperFunctions, appConfigMetabasePath))
{
throw new NotSupportedException(ApplicationServicesStrings.CustomLoader_NotInFullTrust);
}
}
// Step 2: Create the new AD
string binFolderPhysicalPath = helperFunctions.MapPath("/bin/");
AppDomainSetup setup = new AppDomainSetup()
{
PrivateBinPathProbe = "*", // disable loading from app base
PrivateBinPath = binFolderPhysicalPath,
ApplicationBase = helperFunctions.AppPhysicalPath,
TargetFrameworkName = _customLoaderTargetFrameworkName
};
if (configFilePath != null)
{
setup.ConfigurationFile = configFilePath;
}
AppDomain newAppDomainForCustomLoader = AppDomain.CreateDomain("aspnet-custom-loader-" + Guid.NewGuid(), null, setup);
try {
// Step 3: Instantiate helper in new AD so that we can get a reference to the loader
CustomLoaderHelper helper = (CustomLoaderHelper)newAppDomainForCustomLoader.CreateInstanceAndUnwrap(_customLoaderAssemblyName, _customLoaderTypeName,
ignoreCase: false,
bindingAttr: BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.CreateInstance | BindingFlags.Instance,
binder: null,
args: null,
culture: null,
activationAttributes: null);
ObjectHandle ohCustomLoader = helper.GetCustomLoaderImpl(customLoaderPhysicalPath);
// If we got this far, success!
newlyCreatedAppDomain = newAppDomainForCustomLoader;
return(ohCustomLoader);
}
catch {
// If something went wrong, kill the new AD.
AppDomain.Unload(newAppDomainForCustomLoader);
throw;
}
}
